REAL

Hemokinin-1 Gene Expression Is Upregulated in Trigeminal Ganglia in an Inflammatory Orofacial Pain Model: Potential Role in Peripheral Sensitization

Aczél, Timea and Kecskés, Angéla and Kun, József and Szenthe, Kálmán and Bánáti, Ferenc and Szathmáry, Susan and Herczeg, Róbert and Urbán, Péter and Gyenesei, Attila and Gaszner, Balázs and Helyes, Zsuzsanna and Bölcskei, Kata (2020) Hemokinin-1 Gene Expression Is Upregulated in Trigeminal Ganglia in an Inflammatory Orofacial Pain Model: Potential Role in Peripheral Sensitization. INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES, 21 (8). pp. 1-20. ISSN 1661-6596 (print); 1422-0067 (online)

[img]
Preview
Text
ijms-21-02938.pdf
Available under License Creative Commons Attribution.

Download (3MB) | Preview

Abstract

A large percentage of primary sensory neurons in the trigeminal ganglia (TG) contain neuropeptides such as tachykinins or calcitonin gene-related peptide. Neuropeptides released from the central terminals of primary afferents sensitize the secondary nociceptive neurons in the trigeminal nucleus caudalis (TNC), but also activate glial cells contributing to neuroinflammation and consequent sensitization in chronic orofacial pain and migraine. In the present study, we investigated the newest member of the tachykinin family, hemokinin-1 (HK-1) encoded by the Tac4 gene in the trigeminal system. HK-1 had been shown to participate in inflammation and hyperalgesia in various models, but its role has not been investigated in orofacial pain or headache. In the complete Freund's adjuvant (CFA)-induced inflammatory orofacial pain model, we showed that Tac4 expression increased in the TG in response to inflammation. Duration-dependent Tac4 upregulation was associated with the extent of the facial allodynia. Tac4 was detected in both TG neurons and satellite glial cells (SGC) by the ultrasensitive RNAscope in situ hybridization. We also compared gene expression changes of selected neuronal and glial sensitization and neuroinflammation markers between wild-type and Tac4-deficient (Tac4-/-) mice. Expression of the SGC/astrocyte marker in the TG and TNC was significantly lower in intact and saline/CFA-treated Tac4-/- mice. The procedural stress-related increase of the SGC/astrocyte marker was also strongly attenuated in Tac4-/- mice. Analysis of TG samples with a mouse neuroinflammation panel of 770 genes revealed that regulation of microglia and cytotoxic cell-related genes were significantly different in saline-treated Tac4-/- mice compared to their wild-types. It is concluded that HK-1 may participate in neuron-glia interactions both under physiological and inflammatory conditions and mediate pain in the trigeminal system.

Item Type: Article
Uncontrolled Keywords: orofacial pain; hemokinin-1; trigeminal ganglia; complete Freund’s adjuvant; macrophages; satellite glial cells; neuroinflammation
Subjects: Q Science / természettudomány > QH Natural history / természetrajz > QH301 Biology / biológia > QH3015 Molecular biology / molekuláris biológia
R Medicine / orvostudomány > R1 Medicine (General) / orvostudomány általában > R850-854 Experimental medicine / kisérleti orvostudomány
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 30 Sep 2020 09:45
Last Modified: 30 Sep 2020 09:45
URI: http://real.mtak.hu/id/eprint/115474

Actions (login required)

Edit Item Edit Item